CT lung shows inflammation, and some patients may develop cancer, mostly due to inflammatory reactions in the lungs, such as invasion by viruses, bacteria, mycoplasma, chlamydia, rickettsiae, and even Mycobacterium tuberculosis, fungi and other pathogens, which cause inflammatory reactions. In addition, it can also be seen in malignant tumors, such as bronchopulmonary cancer, alveolar cell carcinoma, etc. Due to the gradual growth of the tumor, the tumor will block the airways of the lung tissue, which is easy to be combined with the above mentioned diseases, and the infection will not be cured, resulting in the so-called obstructive pneumonia. For lung inflammation that is ineffective in long-term treatment, it is also necessary to consider the possible existence of pneumonia caused by this kind of tumor.